Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Sears/chaimberlin opener does not operate

The door opened fine. Now it will not close. The lights on the sensors are out. I checked wires/connections, sensor aim, etc. Is there any way to test the opener without the sensors?
Thanks

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  • davevl Aug 24, 2008

    I am having gtghe same problem. It pened fine, but wont close. It starts to close, but then reverses like it would if something was blocking the door. I disconnected the beam as well as the wall switch to try to narrow the problem. It still does the same thing. Looking for any help I can get.

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IF YOU HOLD DOWN THE WALL BUTTON IT OVERRIDES THE SENSORS.
IF IT WORKS WHEN HOLDING DOWN THE BUTTON - THE PROBLEM IS IN THE EYES SOMEWHERE.

HOPE THIS HELPS

Posted on Jun 17, 2010

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1 Answer

Garage door opener not working


Sensor must show steady light to close circuit and let opener work. If aligned, then there is a loose or broken wire. Try reaiming first to get steady light. Then check all wires . Another way to test and prove that is the issue is if u hold down the wired button at ur back door and the opener closes, then it is sensor issue. Good luck.

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The green eye receives the the signal from the Amber side. When is not on the sensors won't work. As far as the cold chamberlain did have a few issues with sensors not working or intermediate issues in cold weather. Their solution was to replace the sensors. But before you do that check everywhere the wires are stapled. Make sure that they are not pinching the wires.

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Unhooking the wires disconnected the safety sensors completely. The safety sensors are required to close the door. Both lights should be on, the lenses should be able to see each other clearly, and the wires between the sensors and the opener must be intact, in order for the system to function properly. Reconnect the wires to the opener, adjust the aim of the sensors, ensure there is no debris in the sensor lenses, and if it still doesn't work, you'll need a set of replacement sensors.

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1 Answer

Chamberlain garage door will not close


See if both sensors stay lit until the door reaches the closed position.

If either light is off or flickers the door will go back up. Try aiming the eyes very carefully. If they are aimed properly. Check the wiring if you move the wires and the light flickers you have a bad connection. If the lights don't come on you may have a broken wire.

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My red light sensor is blinking constantly and the green light sensor is steady. I grab hold of the red light sensor and squeeze and the light goes solid and I am able to close the garage door. when i let...


It sounds like there might be a loose wire connection on the inside of the sensor. You could also be moving the position of the sensor slightly into alignment when you squeeze the sensor. You will need to disconnect the wires for the sensor on the garage door opener or disconnect the power. Then use a flatblade screw driver and carefully seperate the sensor case. Check for any loose connections on the wiring(you might need to re-solder the wire to the sensor eye). It sounds like a loose wire connection to me.

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My Craftsman garage door opener opens fine. When I try to close it the door starts to close, stops, the light flashes and it goes back up. I replaced the two sensors thinking one must be burned out. Before...


Make sure the sensors are wired correctly. The solid white wire from each sensor goes to terminal #2 and the wires with the black stripe go to terminal #3.

Each of the sensors has a small light that must be on for them to work properly. There is a possibility you could have a bad wire. Check to make sure something like a staple hasn't cut the wire.

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HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

THERE ARE LED'S THEY SHOULD BOTH BE LIT - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

IF ALL ELSE FAILS GET SOME DOORBELL WIRE AND BYPASS THE EXISTING WIRES AS A TEST - BE SURE TO CHECK THE POLARITY & LOOSE CONNECTIONS.

HOPE THIS HELPS

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One sensor should always be yellow, the other should be SOLID green.
If the lights are not consistently SOLID, you have a sensor issue.
TEST: If the door closes completely by pressing and holding down the wall pad button, you have a sensor problem.

Check to make sure the are aimed properly at each other.
Check the wire at the sensor and more importantly at the machine (If the wires are loose at the machine (terminals) it can cause this problem. Remember the machine does shake a lot.
If the wires are good, the sensors are aimed correctly, you have a sensor issue and need to loacte a replacement set.

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1 Answer

Garage door will not close


HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.

ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH OTHER?

Jan 21, 2009 | Sears Craftsman LiftMaster Chamberlain...

4 Answers

Door will only close when held down


That normally happens when the sensors aren't aligned. Both sensors have led lights on them the yellow/orange one will stay on all the time the green one will go out if it cant see the other sensor. Possibly theres a wire that's broken or the other sensor is really out of alignment. Check every inch of wiring from the sensor to the opener, remove wire nuts if present and check the connections. The wires that are used are small, solid and can break easily. Also see if there's a staple that's too tight, move the wire abit where it's stapled and look for damage.

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